Fuse device.



VIi. 0. SCHWEITZER.

FUSE DEVICE.

APPLICATION FILED JAN.' I6, 19H.

Patented Sept. 17, 1918.

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IIIIIS I mmh! mm o c.

UNITED STATES PATENT OFFICE.

EDMUND O. SOHWEITZERJ OF CHICAGO, ILLINOIS.

FUSE DEVICE.

Original application led April 21, 1913, Serial No. 762,463.

Specification of Letters Patent.

1914. Serial No. 812,369.

To all whom it may concern.' v

Be it known that I, EDMUND O. SOI-rwnrrzER, a citizenof the United States, residing at Chicago, in the county of Cook and State of Illinois, having invented a certain new and useful Improvement in Fuse Devices, oi' which the following is a Jfull, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to fuse devices.

Prominent objects of the invention are to provide a simple, practical, andeiiieient type oi' fuse device, to secure a high degree oi' sensitiveness and accuracy; to secure reliability of operation; and to secure the foregoing and other desirable results in a simple and expeditious manner.

In the accompanying drawings I show my invention applied to apparatus for controlling a B-phase system, but it will be understood that the invention can be applied to other apparatus and in other ways.

In the accompanying drawings, Figure l is a view illustrating a multiphase system and a motor therein, and a circuit opening arrangement having fuse devices embodying my present invention;

Fig. 2 is a view of the fuse itself;

Figs. 3, 4 and 5 are views of modiiied forms of fuse devices; and

Fig. 6 is a view similar to Fig. l of a modified arrangement of the invention.

In the accompanying drawings, and especia-lly in Figs. 1 and 2, a S-phase system with conductors 1, 2 and 3 is shown, said conductors leading to a motor 4;. In each of the conductors l, 2 and 3 are located fuses 5, 5a and 5b, which may be the ordinary type of fuse adapted to ope-rate or blow in the usual way upon an overload in the circuit conductors in which said Juses are respectively located. I also show heating coils 6, 6, and 6J of resist-ance wire wound about the several fuses 5, 5a and 5b. These heating coils 6, 6L and 6" are of suiiiciently tine and high resistance wire to generate suiiicient heat to melt or operate the fuses 5, 5a and 5b, upon a predetermined overload current flowing in said coils, 6, 6a, and 6b. The coils 6, 6a, and 6b, are preferably connected so as to receive current from the circuits or conductors other than the circuits or conductors containing the fuses which said coils respectively include. As one arrangement I show in Fig. l the coil 6 for the fuse 5 in conductor l connected by conductors 7 and 8 in shunt with conductor 3; the coil (ifL for fuse 5a included by conductors 9 and l0 in shunt with conductor l and also coil 6b for fuse 5h connected by conductors ll and l2 in shunt with conductor 2. Thus the fuse 5, for example, may be operated by an overload current in con-l ductor 2 because of the coil 6 receiving current from the circuit including conductor 2. Similarly fuse 5a may be operated by an overload current in conductor 2, and also an overload current in conductor l, and also fuse 5b may be operated by an overload current in conductor 3, and also by an overload current in conductor 2. Thus it will be seen that if for example an overload current in conductor l should operate or blow ii'use 5, but the other conductors 2 and 3 of the system were not receiving suliicient overload current to blow the fuses 5a and 5b, respectively, as for example where said fuses take more current than they should, as sometimes happens, the overload current in conductor l would to some extent persist notwithstanding the blowing of the fuse 5, and would pass by conductors 9 and 10 through coil 6a and thereby produce a heating eii'ect upon fuse 5a in conductor 2, which heating effect together' with the load in fuse 5a would operate the latter, and thereby cut out the motor. Thus the entire system would be fully protected by the operation oi' the fuses in connection with the coils 6, 6a and 6b, it being understood that the latter are sufficiently fine to burn out when the fuses with which they are associated have operated. Thus it will be seen that full protection may be accorded to apparatus on S-phase or polyphase systems, and so serious damage and injury may be prevented upon such systems where previously it has occurred by reason of the operation of the fuse in one line and the failure of the fuses in the other lines to operate.

In Fig. 2 I show one way in which the fuses 5, 5a and 5b may be associated with the coils 6, 6a, and 6b. Fig. 2 shows a fuse of more or less usual type having apertures or slots 14- and 15 for connection with binding posts or terminals and a coil of wire 6 wound about said fuse and especially the middle portion thereof, layers 16 of mica or other material being placed on opposite sides of plied to inclosed fuses. In Fig. 3, lfor example, is a cylindric inclosed fuse 21 having a cylindric sleeve or housing 22 applied to it, a heating coil for melting the inclosed fuse being arranged in or carried by the sleeve 22, the ends of said coil being connected conductors 23 and 24. Y

In Fig. 4 I show an inclosed fuse 25, in which the interior fuse proper 26 is surrounded by a'heating coil 27, from which connecting conductors 28- and 29 are ex-v tended. Y

In Fig. 5 I show an inclosed fuse 30 containing a glass tube 31 in which a fuse 32 is extended, the glass tube 31 being surrounded by a heating coil 33, to which connection may be'made by conductors 34 and 35.

It will be understood that my inventionv may be applied and used in Ways other than A Y those shown herein, and that changes and Gopies of thisl patent may be obtained for modifications can be made in the structure herein Without departing from the spirit of the invention." Y

This application is a division of my appli cation lSerial No. 762,463, filed April 21,

What I claim is: Y

1. A* cartridge fuse having an insulating casing provided With errules and .havinga hea-ting element arranged Within said casing, said heating elementv having terminals passing through said insulating casing.

2. An externally controlled fusible cut-out having -a casing of insulating material provided With annular terminals and suppleymentary terminals passing through the extremities of Said casing. Y p Y 3. A cartridge fuse having a casing provided With ferrulesf and alsohaving a fuse link extending between the errules and a heating coil surrounding the fuse link Ybetween the errules, the ends of the heating coil being extended through the shell or casing of the device between the errules.

In Witness whereof, I hereunto subscribe my name this`23rd day of December, A. D.

l EDMUND OSCHIVEITZER.

Witnesses: n

` A. 1L. JONES, II. A. JONES.

ve cents each, by adlfressing the Commissioner of Patents Washing'tn. 11C. Y 

